# Inductance and Capacitance INEL 4075 –Chapter 7 Dr. Sandra Cruz-Pol Professor Electrical & Computer Engineering UPRM.

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Inductance and Capacitance INEL 4075 –Chapter 7 Dr. Sandra Cruz-Pol Professor Electrical & Computer Engineering UPRM

Capacitors Capacitors store electrons in form of separated charge or E field. http://www.kpsec.freeuk.com/components/led.htm

Capacitance, in Farads [F] The capacitance is The charge The current in a capacitor The voltage, cannot change instantaneously

Capacitors Energy stored in capacitor Parallel and Series capacitors

Electric Circuit

Discharging a capacitor

Charge/discharge Capacitor Piezo- electric material

Chip – (integrated circuits) The 555 timer regulator pin layout (from http://www.doctronics.co.uk/555.htm)http://www.doctronics.co.uk/555.htm

1k C (  F)Frequency (Hz) C1.100111 C2.068170 C3.047230 C4.033348 C5.022490 C6.015718 C7.0101,173

What is a circuit Board? Nodes?

Myth: Why is the Ocean Blue? FALSE: The ocean is blue because the sky reflection on its surface. TRUE: Water is blue.  frequency spectra  But you need a huge amount of it to really see its color.  Look at a swimming pool as it gets deeper; even on cloudy days. http://ece.uprm.edu/~pol/OceanBlue.html

Myth #2 FALSE: Thomas Edison, greatest contributor to Electricity and systems used today. TRUE: Nikola Tesla – greatest contributor to Electricity.  Invented ac motor,  perfected dc motor,  invented radio transmission, (wireless)  designed Niagara Falls generator,  distribution systems,  fluorescence lamps,  remote control, wireless,  logic circuits,  3 phasic and many others.

Inductors Store magnetic fields Symbol

Inductors Energy storage – inductors store energy in the form of a magnetic field Series and parallel inductance Initial conditions of switch circuits solenoid

Inductance, in Henries [H] The inductance is The voltage in an inductor The current, cannot change instantaneously

Inductors Energy stored in inductor Series and Parallel inductors

Where to find this material? http://ece.uprm.edu/~pol/cursos/cursos Also look at: http://casa.ece.uprm.edu http://ece.uprm.edu/climmate

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